VM Spec

d2l

Operation
Convert double to long

d2l

Forms
d2l = 143 (0x8f)

Stack
..., value.word1, value.word2 ..., result.word1, result.word2

Description
The value on the top of the operand stack must be of type double. It is popped from the operand stack and converted to a long. The result is pushed onto the operand stack:

If the value is NaN, the result of the conversion is a long 0.
Otherwise, if the value is not an infinity, it is rounded to an integer value V, rounding towards zero using IEEE 754 round-towards-zero mode. If this integer value V can be represented as a long, then the result is the long value V.
Otherwise, either the value must be too small (a negative value of large magnitude or negative infinity), and the result is the smallest representable value of type long, or the value must be too large (a positive value of large magnitude or positive infinity), and the result is the largest representable value of type long. Notes

The d2l instruction performs a narrowing primitive conversion (§2.6.3). It may lose information about the overall magnitude of value, and may also lose precision.

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Java Virtual Machine Specification (HTML generated by dkramer on February 25, 1997)
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